// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_APP_LIST_APP_LIST_ITEM_LIST_OBSERVER_H_
#define UI_APP_LIST_APP_LIST_ITEM_LIST_OBSERVER_H_

#include <stddef.h>

#include "ui/app_list/app_list_export.h"

namespace app_list {

class AppListItem;

class APP_LIST_EXPORT AppListItemListObserver {
public:
    // Triggered after |item| has been added to the list at |index|.
    virtual void OnListItemAdded(size_t index, AppListItem* item) { }

    // Triggered after an item has been removed from the list at |index|, just
    // before the item is deleted.
    virtual void OnListItemRemoved(size_t index, AppListItem* item) { }

    // Triggered after |item| has been moved from |from_index| to |to_index|.
    // Note: |from_index| may equal |to_index| if only the ordinal has changed.
    virtual void OnListItemMoved(size_t from_index,
        size_t to_index,
        AppListItem* item) { }

    // Triggered after the item at the corresponding index in the top level has
    // started or completed installing and should be highlighted.
    virtual void OnAppListItemHighlight(size_t index, bool highlight) { }

protected:
    virtual ~AppListItemListObserver() { }
};

} // namespace app_list

#endif // UI_APP_LIST_APP_LIST_ITEM_LIST_OBSERVER_H_
